feat(product-center): implement Figma-designed UI, upload module, and website tests

- Redesign website homepage & product-center per Figma (fonts, logos, hero/footer/customer cases)
- Add API upload module (multer) with static serving for uploads/public assets
- Add OriginGood.delisted flag and SDS request retry logic
- Add admin ImageUpload component and goods import/upload flows
- Add vitest suite for website components and composables (32 tests)
- Add skills, docs, plans and PRODUCT.md

apps/website/app/components/product/ProductCenterHeader.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+const portalUrl = 'https://inkpod.vip/portal/search';
+const loginUrl = 'https://inkpod.vip/user/login';
+</script>
+<template>
+  <header class="header">
+    <NuxtLink to="/" class="logo"><img src="/logo-unified.svg" alt="InkReach" /></NuxtLink>
+    <nav><NuxtLink to="/product-center" class="active">产品中心</NuxtLink><a :href="portalUrl" target="_blank">在线设计</a><a href="#">选品推荐</a><a href="#">解决方案</a></nav>
+    <div class="actions"><a :href="loginUrl" target="_blank"><i class="fa-solid fa-desktop"></i>工作台</a><a :href="loginUrl" target="_blank"><i class="fa-solid fa-cart-shopping"></i>购物车</a><a class="phone" href="tel:18588980344"><i class="fa-solid fa-circle-user"></i>18588980344<i class="fa-solid fa-chevron-down"></i></a></div>
+  </header>
+</template>
+<style scoped>
+.header { position: fixed; z-index: 60; top: 0; left: 0; right: 0; display: flex; align-items: center; height: 80px; padding: 0 70px; border-bottom: 1px solid #e5e7eb; background: #fff; }
+.logo { width: 97px; height: 56px; display: grid; place-items: center; }.logo img { width: 97px; height: 56px; object-fit: contain; }
+nav { display: flex; gap: 32px; margin-left: 44px; } nav a { color: rgba(0,0,0,.5); font-size: 18px; text-decoration: none; white-space: nowrap; } nav .active { color: #000; }
+.actions { display: flex; align-items: center; gap: 24px; margin-left: auto; }.actions a { display: flex; align-items: center; gap: 8px; color: rgba(0,0,0,.62); font-size: 16px; text-decoration: none; white-space: nowrap; }.actions i { font-size: 18px; }.actions .phone { color: #222; font-size: 18px; }.phone .fa-chevron-down { margin-left: 4px; font-size: 10px; }
+@media (max-width: 1000px) { .header { padding: 0 20px; }.header nav { display: none; }.actions a:not(.phone) { display: none; } }
+@media (max-width: 520px) { .actions .phone { font-size: 0; }.actions .phone i { font-size: 20px; } }
+</style>